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Body Fat Calculator

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Body Fat Calculator - With BMI (Body Mass Index), BMR (Basal Metabolism Rate) and Daily Caloric Needs Calculation (see terms of use)



Hip (Female):


US Navy Body Fat calculator


This Body Fat calculator uses Height and Circumference method used by The United States Navy to measure the percentage of  body fat. This is the simplest and fastest technique for estimating your percentage of body fat . The U.S. Marine Corps and U.S. Army also use  this method. During a U.S. Navy study, it  was shown to be as accurate as caliper skinfold testing, however with a lower standard error of estimation. All that is required is measuring tape. After taking exact  measurements, the following formulas are used to calculate the body fat percentage.



Metric Formula (Cm):
Men Percentage of Fat = 495 / (1.0324 - 0.19077 x (LOG10(waist - neck)) + 0.15456 x (LOG10(height))) - 450
Women Percentage of Fat = 495 / (1.29579 - 0.35004 x (LOG10(waist + hip - neck)) + 0.22100 x (LOG10(height))) - 450
English Formula (Inch):
Men Percentage of Fat = (86.01 x LOG10((waist) - (neck))) - (70.041 x LOG10(height)) + 36.76
Women Percentage of Fat = (163.205 x LOG10((waist) + (hip) - (neck))) - (97.684 x LOG10(height)) - 78.387


Use the table below to estimate your body status.



Indication of Body Fat Percentage to Fitness
Women Men Body Status
Percentage of  body fat:
10 to 12 2 to 4 Essential fat
14 to 20 6 to 13 Athletes
21 to 24 14 to 17 Fitness
25 to 31 18 to 25 Acceptable
32% or more 26% or more Obese


BMR Calculator:


The BMR or Basal Metabolic Rate is the calorie requirement for your body to function when you are in complete rest. The formula for BMR is:



English Formula (Inch and Pound):
Women BMR = 655 + ( 4.35 x weight ) + ( 4.7 x height ) - ( 4.7 x age in years )
Men BMR = 66 + ( 6.23 x weight ) + ( 12.7 x height ) - ( 6.8 x age in year )
Metric Formula (Cm and Kg):
Women BMR = 655 + ( 9.6 x weight ) + ( 1.8 x height ) - ( 4.7 x age in years )
Men BMR = 66 + ( 13.7 x weight ) + ( 5 x height ) - ( 6.8 x age in years )


Daily Calorie Needs Calculator


Determine your total daily calorie needs by multiplying your BMR by the listed activity level below. The daily calorie need is calculated with the help of Harris-Benedict principle which states how the Basal Metabolic Rate (BMR) is calculated.


Your Activity Level: Daily Calorie Need
Sedentary (little or no exercise) BMR x 1.2
Lightly active (light exercise/sports 1-3 days/week) BMR x 1.375
Moderately active (moderate exercise/sports 3-5 days/week) BMR x 1.375
Very active (hard exercise/sports 6-7 days a week) BMR x 1.725
Extra active (very hard exercise/sports & physical job or 2x training) BMR x 1.9


Weight Loss Calculator

This is a very general calculation and like all of these calculators may give you a general idea of the direction you are moving in rather than and exact amount which is perfect for you.  This does not take the place of a consultation with your doctor and is for educational purposes only. The weight loss calculator calculates how much body fat you have to reduce (if needed) to get a healthy weight. If your percentage of body fat is more than acceptable limit (see table-2) you have to reduce your body fat to avoid some health risk like Diabetics, Type-2 Cancer, Sleep Arena, etc. The rule for good weight loss is slow and steady. A rate 5% to 10% is recommended. The calorie equivalent of body fat is 3500 calorie per pound, i.e. if you want to reduce one pound of your body fat in one week you have to reduce 500 calorie per day from your required daily calorie need and total 7 x 500 = 3500 calorie in a week.


What is BMI


BMI stands for Body Mass Index. It is a number calculated for a person's weight and height. This data is extensively used by the health personalities to measure and compare the body fat of a person. BMI is not a direct measure of body fat. But as statistics are available for normal health people, BMI is good substitution of direct body fat measurement and gives fairly good result for most of the people.

BMI for adult:



BMI Weight Status
Below 18.5 Underweight
18.5 to 24.9 Normal
25 to 29.9 Overweight
30.0 or above Obese



Advantages and limitations of BMI:

 The main advantages of BMI as a body fat indicator are:

  • BMI is very easy to measure. Only two parameters, height and weight are required which can be easily measured by common people.
  • As it is accepted as a general standard for measuring body fat, a person can compare his health with others.

The limitations of BMI are:

  • BMI can't discriminate between body fat and muscle. So a body builder may find himself as obese in BMI scale.
  • Age and sex are not considered in BMI measurement. So analysis of BMI varies with those parameters.

Though no online method can give you accurate measurement of your body fat, the waist circumference method developed by US Navy gives you much better prediction.


Terms of Use

These calculators may not substitute for the advice of a physician and are here only for educational purposes. They are best used to keep track of your general direction rather than an exact measurement since they are estimates and rely on data which is generalized and cannot be applied to one person for reccomendations of weight loss or health. Please see your physician or nutritionist for individualized recommendations.